Better late than never...
Yes, All OBD2 240SX's have a map (absolute pressure) sensor, its not for fuel metering its part of the emissions system.
Here's were it is:
Try your local stealership or
http://www.midwaypartsteam.com/ for a replacement.
I couldn't find any reference to a GST code or mil code 1302 or 132 but here are a couple of close ones:
P0130 (mil code 0303/0307) Front heated oxygen sensor/Closed loop control
P1105 (mil code 0302) Map/Baro switch solenoid valve
P1320 (mil code 0201) Ignition signal circuit.
In the future it would be best to forego the sheety scanner and just use the diagnostic pot on the side of the ecu.